One protester told the media: "In here [the ABC] public opinion is shaped artificially. It's not democratic. It's not Australian".

The group left a short time after.

On their Facebook page, the United Patriots Front declare themselves as a movement "opposing the spread of Left Wing treason and spread of Islamism".

The ABC has been heavily criticised this week for allowing Zaky Mallah, a terror suspect who admitted to threatening to kill Australian security officials but was acquitted of the charges, to appear on Q&A.

An ABC spokesman would not comment on Saturday's protest.

He would also not say how many threatening phone calls the ABC had received or if any had been referred to police.